Installing walls and trusses

So I am looking at installing my walls soon. I will be using 1/2inch osb board. I was wondering what the best way to go about doing it was. obviously I will use some 2x4 framing in between my 4x4 posts. I was thinking I would set the framing back a half inch and set the wall on the floor of the coop and in between the 4x4 posts. Is that necessary? or can I just nail it into the frame and or 4x4 posts and have it hanging off? I wasn't sure if the entire weight of the wall would be too much stress on the nails/screws holding the walls up.

I wouldn't suggest using OSB (esp. not 1/2") for your walls unless it will be covered with Real Siding?

Does this coop have a wooden floor? In which case the walls need to rest on top of the floor (on the floor joists/sills anyhow).

If OTOH it is a pole-built shed with a dirt floor, you would not normally do stud-framed walls in the first place, but if you do then I'd suggest resting them on a sill or ledger or whatever ya wanna call it, a board bolted horizontally between the bottoms of the posts.

One rafter tie (or hurricane tie or whatever you want to call it) per end of truss, so, 2 total per truss. Make sure to use the correct nails -- they are shorter and fatter than normal nails, and galvanized with a sort of rough surface, they are made specifically for use with this type hardware.

I would not set your framing back 1/2". I'd put the framing flush with your 4x4's so that I can attach the sheeting to the frame and the posts. Once you hit 10 posts you can put up pictures -- run and make 7 more silly posts, then come back and show us pictures of what you have so far. We can really give good advice when we can see what you have so far.

Either way with the osb will work. It will be stronger and tie everything together if you keep your framing flush with the 4x4 and floor system and nail the osb over it all. Just rember osb is 8' long If you have 8' walls you will have to put small pieces in to fill the gap.

As far as the hurricane straps, you can get away without them. If you want the piece of mind just put one on each end of the truss (2 per truss).

You should use screws for the OSB as nailing into it is difficult unless you have a framing nail gun. In addition, you should use screws such as 'deck screws' that can tolerate treated wood. If you use regular screws, they will rot out in no time with the treated wood. I am using 2 1/2" screws myself but that is because I already had a half a box from my house construction. You could easily use 2" as my guess is the OSB you are installing is 7/16"? You just want to make sure you get a good 1" into the posts. I use other hardware for installing trusses and joists such as hangers.

I am a big fan of using deck screws. 2 1/2" for framing the walls and 1 1/4" for attaching the siding. I used truss ties on my coup, 2 per truss and used deck screws (1 1/4") to attach them. If you use deck screws it will not rust and you could always take it apart for remodeling, redesign, or to move it. I just feel screws are much better than nails any day.